python – 在类“主要缺陷”中实现装饰器？

class User(object):

    def __init__(self):
        self.thing = 5

    def __atomic_rate_change(fn):
        def wrapper(self,*args,**kwargs):
            print "start magic"
            self.thing += 1
            fn(self,**kwargs)
            print "end magic"
        return wrapper

    @__atomic_rate_change
    def foo(self,add):
        print self.__atomic_rate_change # <bound method User.__atomic_rate_change of <__main__.User object at 0x6ffffe1ef50>>
        self.thing += add
        print "normal call {0}".format(self.thing)

test = User()
test.foo(1)

这有效.但是,根据下面的资源,这是不好的做法.理由是：

[…] there is major flaw in this approach: atomic_rating_change becomes an
instance method of the User class. That doesn’t make any sense. More
than this,it doesn’t even work as a method: if you call it,the
decorated parameter will be used as self.

https://medium.com/@vadimpushtaev/decorator-inside-python-class-1e74d23107f6

我不明白为什么atomic_rate_change是一个实例方法是一个问题/错误/错误.我只是打算在类中使用装饰器.也许在这种情况下它没关系？